Huawei Technologies Co., Limited

Pengfei Luo

Tong Jiang

Wei Wang

Zhengxiang Ma

Siqing Ye

Shaofeng Xu

A radar power control method and an apparatus are provided. The method includes: emitting a first detection signal at a target emission angle; obtaining a reflectivity of a first detection point of the first detection signal if signal power of an echo signal of the first detection signal is less than a preset power threshold, where the first detection point is a point on a surface of a detected object in a direction of the target emission angle; and increasing emission power corresponding to the target emission angle if the reflectivity of the first detection point is greater than a preset first threshold. The solution helps consider both power consumption and a detection distance of a radar.

Radar power control method and apparatus

Embodiments of this application disclose a communication method and an apparatus, and relate to the communications field, to resolve a problem of how to simultaneously perform transmission by using a plurality of light sources and increase transmission efficiency in a multi-light source scenario in an optical camera communications system. A specific solution is: generating N physical frames, where each of the physical frames includes a preamble, a mode indication, and valid data, the mode indication is used to indicate a sending mode of N light sources, the sending mode is a diversity mode or a multiplexing mode, and N is a positive integer greater than or equal to 2; and sending the N physical frames by using the N light sources, where one light source sends one physical frame. The embodiments of this application are used in an optical camera communication process.

Light sources communication method and apparatus

A method includes receiving X pilot symbols, determining light source sequence numbers of the X light sources based on the X pilot symbols, receiving M&#xd7;X undersampled pulse width modulation-based pulse position modulation (UPPM) symbols and parsing the M&#xd7;X UPPM symbols thereby obtaining original data from a sending node by using N light sources. Each of the X pilot symbols includes W waveform segments. Each of the W waveform segments includes a first light source sequence number indication part that indicates a light source sequence number. Waveforms of waveform segments with odd sequence numbers in the W waveform segments are the same, waveforms of waveform segments with even sequence numbers in the W waveform segments are the same, and a duration of each of the W waveform segments is equal. The X pilot symbols are in a one-to-one correspondence with X light sources.

Camera communication method and apparatus

A data transmission method, device, and system includes, when a preset condition is met, determining a quantity N of first symbols included in one first symbol group and a quantity K of bits transmitted in the first symbol group, where the preset condition is &#x2514; logm&#x2518;&#x3e;N&#xb7;&#x2514; logm&#x2518;, K=&#x2514; logm&#x2518;, m&#x2265;2, N&#x2265;2, and K&#x2265;3; obtaining X data blocks, where each of the first X&#x2212;1 data blocks includes K bits, the last data block includes Y bits, X&#x2265;1, and K&#x2265;Y&#x2265;1; and processing each of the X data blocks into N first symbols to obtain NX first symbols, and sending the NX first symbols.

Data transmission method, device, and system

A standing wave detection method, a standing wave detection apparatus, and a base station are disclosed. The method includes collecting, a feedback signal from a feedback path of a base station which uses a baseband multi-tone signal as a transmission signal; performing calibration on the feedback signal by using stored calibration data to obtain a reflected signal in the feedback signal; and obtaining a standing wave detection value according to the transmission signal and the reflected signal that is in the feedback signal.

Growing community of inventors

Beijing, China

Pengfei Luo